Based on the principle introduction of the Cyclic Redundancy Check（CRC）code

a CRC error detection simulation experiment system is designed by using Visual C# programming language in this paper.The software algorithms of CRC-8

CRC-16 and CRC-CCITT standard are realized

and the operation of CRC encoding and decoding in communications system are simulated in this experiment system.In the view of the random errors and burst errors happening during data transmission

the undetected situation of CRC code under the error-prone channel with single bit error

two bit error

odd bit error and burst error are displayed.By analyzing and calculating the undetected error probability of CRC code

the theory of CRC code error detection capability is verified.